Combined sound and picture film



March 10, 1942. L. s. WlLDER 2,275,710

COMBIN ED SOUND AND PICTURE FILM Filed Nov. 9, 1940 NEG/4 T/l EEXPOSURE.

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I/YFRA RED EXPOSURE SOL/ND TRACK PR/N TED (GLUE LIGHT).

TON/N6 REVERSAL EXPOSURE AND 6020/? DEVELOPMENI L076. Z/V/LDER INVENTOR,W

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Patented Mar. 10, 1942 2,275,710 I common SOUND AND PICTURE FILM :Lot S.Wilder, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester;N. Y., a cor- 'poration of New Jersey Application November 9, 1940,Serial No. 365,082

In Great Britain January 3, 1940 11 Claims.

This invention relates to a method ofrecording sound in photographicmaterials and especially to the recording of sound in multi-layermaterials for color photography.

The recording of sound and picture images on motion picture filmcontaining a plurality of "differentially light sensitive layers whichare processed to color has heretofore presented difli- Thecharacteristics of contrast and density desirable for the sound trackare seldom compatible for those required for optimum picture quality andthis is particularly true where the multilayer material is processed byreversal.

- Consequently, it is desirable to form the positive sound track byprinting. from a negative rather than a master positive and forming thepositive development process. i

It has been proposed in color'processes of th picture images by theusual'selective reversal selective reversal type to use an interlayerbetween two of the emulsion layers containing a light absorbing materialto restrict reversal exposure to a single layer. A fogged emulsion whichhas been converted to silver by development, and yellow Carey-Leasilver, have been the most satisfactory layers for this purpose. Asdescribed above, for reasons of quality obtained it is highly desirableto have negative sound tracks on reversal color films. One way ofaccomplishing this consists inconverting the nega I tive silver in thesound track area to gold. This toning process has been described inMannes and Godowsky application Serial, No. 298,116, filed I October 5,1939, whereby in a film in which both colored picture images and soundimages occur the negative sound image may be gold toned and the pictureimages formed by the selective reversal color process. However, duringthis toning process the silver in the conventional interlayers in thesound track area is also converted to gold and since this producesunwanted density in the sound track area the resultant film is ,not ofhighest quality.

One object of the present invention is to provide a means of satisfyingthe requirements for an interlayer containing density in the picturearea without undesirable silver in the sound area. Another object is toprovide a process which avoids the use of a screening dye which isstable to the processing solutions used in the selective reversal colorprocess andis easily removable in weakly oxidizing bleach baths. Suchdyes are not common and they are applied to color processes with utmostdifiiculty.

These objects are accomplished in the' present invention by providing amultilayer sound and picture film with a light-absorbing interlayerwhich is sensitized to a region of the spectrum other than that to whichany of the other emulsions are sensitive and which may be fogged anddeveloped to silver in the picture area, the sound record beingprintable to the desired density and quality in the sound track area. Iv

More specifically, I sensitize the .interlayer to the infra-red regionorin a narrow band of the spectrum such as the yellow region, which theother differentially light sensitive layers of a film do not record.This narrow-band sensitization has been described in the priorapplication of L. M. Dearing, Serial No." 328,311, filed April 6, 1940.The interlayer contains a soluble light absorbing dye such astartra'zine or fiuorescein which serves to screen underlying layersduring exposure of the picture area and is removable in negativedeveloping solutions.

'The sensitizationof the interlayer to a region such as the infra-redthen enables me to obtain a silver interlayer during-first developmentin the picture area only by exposing this area with infra-red lightbefore processing. The following description illustrates a methodof'processing a film such as I described. The accompanying drawing showssectional views of a multilayer film, the various figures representingvarious stages in the processing treatment.

The multi-layer film comprises a support l0 upon which are laid in orderemulsion layers, H red sensitive, l2 green sensitive, l3 infraeredsensitive, and I4 blue sensitive. After exposure of the material in acamera as shown in the first stage of' the drawingthe infra-redsensitive interlayer I3 is fogged with infra-red light in the picturearea, as shown in the second stage of the drawing, the sound track isprinted with blue light, stage 3, and the film subjected to negativedevelopment whereby negative silver images are formed in the sound areai5, and the picture areas, and the screening dye of the infra-redsensitive layer is removed, a dense layer'of metalrial and processdescribed I have succeeded in producing a sound image of the requireddensity and quality and have obviated the use of the conventionalcolloidal silver interlayer in the sound area of a film.

While I have described only one means of opcrating the process I mayvary the procedure by the appropriate selection of photographicmaterials and processes. I may position the light absorbing inter-layerwhich is sensitive to radiations other than those to which the otheremulsions are sensitive, between any of the sensitive layers of amulti-layer sound-color film. The inter-layermay be fogged before orafter exposure of the picture area, on before orafter exposure of thesound area. The soundimage area may be printed and toned after thenegative development of the picture areas. My invention, therefore, isto be understood as limited only by the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. The method of forming sound and natural color picture images in afilm having a plurality of layers sensitive to different spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises exposing the picture area to form anima therein and fogging only in the picture area the lightabsorbinginterlayer sensitized to a region of the spectrum other than that towhich any of the other emulsions are sensitive, printing the sound imagein the sound area, developing the film and gold toning only the soundimage and subjecting the film to a series of exposure and colordevelopment steps to produce silver and dye images in the layers, thecolor development being one in which a color forming compound coupleswith the oxidation product of the developer and in which the gold soundimage is not affected and then removing the silver images formed in thevarious developmentsteps without affecting the gold or the dye images.

2. The method of forming sound and natural color picture images in afilm having a plurality of layers sensitive -to different spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises exposing the picture area to form animage therein and fogging only in the picture area the lightabsorbinginterlayer sensitized to a region of the spectrum other than that towhich any of the other emulsions are sensitive, printing the sound imagein the sound area, developing the film and gold toning only the soundimage before subjecting the film to a series of exposure and colordevelopment steps to produce silver and dye images in the layers, thecolor development being one in which a color forming compound coupleswith the oxidation product of the developer and in which the gold soundimage is not affected and then removing the silver images formed in thevarious development steps without affecting the gold or the dye images.

3. The method of forming sound and natural color picture images in a'film having a plurality of layers sensitive to different spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises.

which a color-forming compound couples with the oxidation product of thedeveloper and in which the gold sound image is not affected and thenremoving the silver images formed in the various developmentstepswithout affecting the gold or the dye images.

4. The method of forming sound and natural color picture images in afilm having a plurality of layers sensitive to different spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises exposing the picture area to'form animage therein and fogging only in the picture area the light.- absorbinginterlayer sensitized to the infrared region of the spectrum, printingthe sound image in the sound area, developing the film and gold toningonly the sound image and subjecting the film to a series of exposure andcolor development steps to produce silver anddye images in the layers,the color development being one in which a color, forming compoundcouples with the oxidation product of the developer and in which thegold sound image is not affected, and then removing the silver imagesformed in the various development steps without/affecting the gold orthe dye images.

5. The method of forming sound and natural color picture images in afilm having a plurality of layers sensitive to different spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises exposing the picture area to form animage therein and fogging only in the picture area the lightabsorbinginter -yer sensitized to the infra-red region of the spectrum. printingthe sound image in the sound area, developing-the film and gold toningonly the sound image before subjecting the film to a series of exposureand color development steps' to produce silver and dye images in thelayers, the color development being one in which a color formingcompound couples with the oxidation product of the developer and inwhich the gold sound image is not afiected, and then removing the silverimages formed in the various development steps without affecting thegold or the dye images.

6. The method of forming sound and natural color picture images in afilm having a plurality of layers sensitive to different spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises exposing the picture area to form animage therein and fogging only in the picture area the lightabsorbinginterlayer sensitized to the infra-red region of the spectrum, printingthe sound image in the sound area, developing the film and gold toningonly the sound image before subjecting the film to a seriesof exposureand color development steps to produce silver and dye images in thelayers, the color development being one in which a color formingcompound couples with the oxidation product of the developer and inwhich the gold sound image is not affected, and then removing the silverimages formed in the various development steps without affecting thegold or the dye images.

7. A method of forming sound and natural color picture images in a filmhaving a plurality of layers sensitive to different spectral regionsand'a light absorbing interlayer between two of the sensitive layers ona support which comprises exposing the picture area to form an imagetherein and fogging only in the picture area of the light-absorbinginterlayer sensitized to the infrared-region of the spectrum andcontaining a dye, printing the sound image in the sound area, developingthe film and gold toning only the sound image and subjecting the film toa series of exposure and color development steps to produce silver anddye images in the layers, the color development being one in which acolor forming compound couples with the oxidation product of thedeveloper and in which the gold sound image is not affected, and thenremoving the silver images formed in the various development stepswithout affecting the gold or the dye images.

8. A method of forming sound and natural color picture images in a filmhaving a plurality of layers sensitive to different spectral regions anda light absorbing interlayer between two of the sensitive layers on asupport which comprises exposing the picture area to form an imagetherein and fogging only in the picture area of the light-absorbinginterlayer sensitized to the infrared region of the spectrum andcontaining a dye, printing the sound image in the sound area, developingthe film and gold toning only the sound image before subjecting the filmto a series of exposure and color development steps to produce silverand dye images in the layers, the color development being one in which acolor forming compound couples with the oxidation product of thedeveloper and in which the gold sound image is not affected, and thenremoving the silver images formed in the various development stepswithout affecting the gold or the dye images.

9. A method of forming sound and natural color picture images in a filmhaving a plurality of layers sensitive to different spectral regions anda light absorbing interlayer between two of the sensitive layers on asupport which comprises exposing the picture area to form an imagetherein and fogging only in the picture area of the light-absorbinginterlayer sensitized to the infrared region of the spectrum andcontaining a dye, printing the sound image in the sound area, developingthe film and gold toning only the sound image after subjecting the filmto a series of exposure and color development steps to produce silverand dye images in the layers, the color development being one in which acolor forming compound couples with the oxidation product of thedeveloper and in which the gold sound image is not affected, and thenremoving the silver images formed in the various development stepswithout affecting the gold or the dye images.

10. The method of forming sound and natural cplor picture images in afilm having a plurality of layers sensitive to different spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises exposing the picture area to form animage therein and fogging only in the picture area before exposure ofthe picture area the light absorbing interlayer sensitized to a regionof the spectrum other than that to which any of the other emulsions aresensitive, printing the sound image in the soundarea, developing thefilm and gold toning only the sound image and subjecting'the film to aseries of exposure and color development steps to produce silver and dyeimages in the layers, the color development being one in which a colorforming compound couples with the oxidation product of the developer andin which the gold sound image is not affected, and then removing thesilver images formed in the various development steps without affectingthe gold or the dye images.

11. The method for forming sound and natural color picture images in afilm having a plurality of layers sensitive to difierent spectralregions and a light absorbing interlayer between two of the sensitivelayers on a support which comprises exposing the picture area to form animage therein and fogging only in the picture area after exposure of thesound area the light absorbing interlayer sensitive to infra-red,printing the sound image in the sound area, developing the film and goldtoning only the sound image, and subjecting the film to a series ofexposure and color development steps to produce silver and dye images inthe layers, the color development being one in which a color formingcompound couples with the oxidation product of the developer and inwhich the gold sound image is not affected, and then removing the silverimages formed in the various development steps without affecting thegold or the dye images.

, LOT S. WILDER.

CERTIFICATE OF CORRECTION. .4

Patent No. 2,27 ,710. March 10, 19h2,

- LOT s. WILDER.

It is hereby certified that error appears in the printed specificationof the above numbered pstent requiring correction as follows; Page 2,sec- 0nd column, line 68, claim 6, for "before" read --after--; and thatthe said Letters Patent should be read with this correction therein thatthe same may conform to the record of the case in the Patent Office.

- Signed and sealed this 2nd day of June, A. D. 19h2.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents.

